Literally, when somebody's brain has stopped functioning such that they will never regain conciousness, hence coloquially somebody who is idiotic, dumb or clueless beyond belief. Similar to "too stupid to live".
by Linton July 11, 2003

Gory zombie horror film of extremely high calibre by Lord of the Rings' Peter Jackson and Fran Walsh. Great stuff.
by cakeandfinewine September 23, 2004

Joe:Poor guy, he smoked way to much pot.
Bill:He's quite the vegetable.
Joe:Maybe we should wipe up the drool from his chin?
Bill:Naw,he is braindead,he will just keep drooling.
Bill:He's quite the vegetable.
Joe:Maybe we should wipe up the drool from his chin?
Bill:Naw,he is braindead,he will just keep drooling.
by Roflmfaoamp May 22, 2009

Jason: Sunny, can I braindead you?
Sunny: Sure thing hun!
*30 minutes later*
Jason: You alright Sunny?
Sunny: I can bake I can bake I can bake
Sunny: Sure thing hun!
*30 minutes later*
Jason: You alright Sunny?
Sunny: I can bake I can bake I can bake
by the savageness May 03, 2011

by APersonYouMightKnow April 23, 2019

A increadibly idiotic individual who hasn't a sustance for anything that is going on. He or she is stupid, retarded, mental, ignorant, annoying, funny to make fun of, or any combination of the previous terms.
"Look at that braindead fool!"
by CrazyBob62 May 21, 2006

by CHINGPINGLING January 17, 2011
